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  1. It's not really much of a ph swing, only a 24hr period after a water change where I bring it back up to 7.8. Then because of the coral, it stays solid at 7.8 for the next month.
  2. I'm trying to figure out why my fish just don't last long and am questioning whether it may be the mold in the filter lines. I have a canister filter and black stuff usually grows to coat the inside of filter lines. I also have it growing in the tubing on my Python device. I don't usually clean it off as it's really hard to do so.
  3. The short answer is that, even if your water params are in order, you're still accumulating fish waste and that's building up. So it's not just nitrates you're removing with a water change, but organic material (dissolved organic compounds and particulates). Basically, all the crud you suck out of the tank or rinse out of the filter media. Also, what are your pH, KH, GH readings? This can also affect the health of your fish. (I ask about pH because I know this can be affected by driftwood.) Edit/add: Your QT period may be on the short side. Especially if you may be bringing home fish with nasties. When I QT I salt and Prazi -- and watch for a month minimum. I had 2 new babies (Kenobi and Sephie) and it took about 2 weeks for ich to pop up. My PH is at 7.0 when it comes out of the faucet and the water is a little soft so I have crushed coral in my filter and buffer with baking soda to a ph of ~7.8. I must admit that I don't premix and age the water though. I add prime as I am filling the tank up for the chlorine. The PH usually drops to about 7.4 until I add baking soda to 7.8 over a period of 24hrs. I have bought fish from almost all of the pet stores in ~60 mile radius of me(5-6 stores), with the same results. I wish I could find some "stronger" fish!
  4. Thanks for all the suggestions. They are all appreciated. Why would it be necessary to do weekly water changes if my ammonia, nitrite are 0 and nitrate are at worst 20ppm when i do my monthly water changes? I quarantine with salt and observation for 2-4 weeks. My filters should flow 1350 gph if the manufacture specs are correct. I usually change the bulb in the UV filter every year or so. I have a bare bottom tank with 2 large pieces of driftwood. I also usually have a couple of banana plants to lower the nitrates.
  5. I never broke down the tank and started over because I thought the UV sterilizer would take care of everything. I might do that though, just as a last ditch effort.
  6. I've had a 72G for about 5 years now and although my tank parameters are consistently good; my fish all seem to die of dropsy or flukes after 3-9 months. I do regular tests and monthly water changes of 40%. I always quarantine fish for at least 14 days. I'm a sucker for Ranchus, Lionheads, Pom Poms. My Father in Law has had the same 2 Koi for the last 4 years in a 30G tank with a tiny HOB filter. All he does is quarterly water changes and feeding. i don't get it.
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